Woven and Knitted Fabric Structural Construction Specifications
Fabric specifications mandate exact finished thread densities, stitch lengths, and test conditions to enforce supplier compliance and control landed costs.
Warp Ends
Weaving Component
A set of longitudinal yarns run parallel to the selvage of a woven fabric and are held under tension on a weaving loom. These threads are known as warp ends, and they are interlaced with the transverse yarns during the weaving process. They do not include the weft yarns or any embroidery threads added after the fabric is woven.
Loom Configuration
The yarns are wound onto a warp beam at the back of the loom and then threaded through individual heddle eyes on the harnesses. This setup allows the loom to raise or lower specific yarns to create the shed through which the filling yarn is inserted. High tension must be maintained on these threads to prevent them from tangling or breaking during the high-speed motion of the loom.
The number of these yarns per inch of fabric width is a primary specification that determines fabric density and strength. Threading these yarns requires extreme precision to avoid weaving errors.
Fabric Structure
Fabric designers adjust the density and pattern of these longitudinal threads to create different weaves like plain, twill, or satin. High-density warp settings produce stronger and stiffer fabrics that are suitable for workwear and upholstery. This structural density directly influences the fabric’s resistance to tearing and abrasion.
Structural Limit
The count cannot be changed once the fabric has been woven. While subsequent washing and finishing can shrink the fabric and increase the density slightly, the total number of threads remains fixed.